Theodicy (Steter / Stiles x Peter Hale / AU)

It was a shock for Peter to find out that the gangly hyperactive teen was his true mate. It seemed like another cruel joke to Peter because Stiles was off-limits. Not only because he was still so young but also because he didn't want Peter that way. But, of course, in a perfidious, strange way, this suited his messed up life perfectly.
(This is not underage, don't worry)